- task: include some first help pages

- task: cleanup help system and integration with advanced_help module

- bugfix: report version info for all gallery* modules
- bugfix: session handling to prevent TempIds
- bugfix: session handling to workaround [sf#1967484] new admin session protection (#250770)
- bugfix: hide search for user without proper permission
- feature: integration with advanced help module (TODO: write documentation)
- task: cleanup block tpl code
- task: add base api version constant

[ported from DRUPAL-4-7] added a missing closing </ul> in gallery_filter_long_tip_translated(). and, being at it, improved formatting of long help strings, with which this wouldn't have happened in the first place.